~project's brainstorming~

date: 25th February 2009
time: 0800-1330
topic: brainstorming ideas

brainstorming... for today's lesson, we have conducted a brainstorming session in order to select the most relevant ideas to be conducted as our project. before this, we have already conducted the brainstorming session. we find the information about the projects from books, magazines, and also internet. however, internet give big helps to us as we found many information trough it. trough the discussions, every group members have given our own ideas regarding to the project. some of the ideas are:

• grabbot - robot that can pick up things
• cleaning robot- robot that can wipe the table and floor
• recycling robot- robot that can lift up things and put it in the bins
• forklift- robot that can lift up things and put it on a higher place
  

after a few further discussion about all of the ideas, we chose one of the idea to build our project. we chose to build the recycling robot and we started to find more information about it. the reason why the recycling robot was selected is because we think that it is the best way in educating pupils about recycling yet in a fun way. students will get the information about recycling as well as robotics by building this robot. after that, we try to build the robot. since this is the early stage of building the robot, we decided to create the body of the robot first. other details will be uploaded in future entries. we'll update you later with more details and images...

quotes of the day:
"we can not detect the wind, but we can adjust the sail"

what do you know parts inside the LEGO MINDSTORMS

hi, my friends...we think, all of you know already what have inside the LEGO MINDSTORMS but you all do not know what is part inside the the LEGO MINDSTORMS untill you all can create a robot...

this part actually, really important for us to know when we want to teach for our student in the class....so, my friends..,we, afrobot will give some information about parts that have inside the LEGO MINDSTORMS...



technic angle connector 2







technic angle connector 6






technic axle pin (tan in NXT)

technic axle pin with friction (blue in NXT)




technic pin ( gray in NXT) technic pin with friction (black in NXT)




technic long pin (gray in NXT) technic long pin with friction (black in NXT)




long pin w /stop bush







technic 3 x 3 bent with pins (hassenpin)








technic axle joiner perpendicular



technic axle joiner perpendicular 3L with center hold







technic axle joiner perpendicular with 2 holes






to be continue......

what do you know inside LEGO MINDSTORMS??

Actually, this is an overview about the LEGO MINDSTORMS all about...we, Afrobot will define about part that involve in the LEGO MINDSTORMS...this information we get it from http://mindstorms.lego.com


THE NXT




The NXT is the brain of a MINDSTORMS® robot. It’s an intelligent, computer-controlled LEGO® brick that lets a MINDSTORMS robot come alive and perform different operations.

Motor ports
The NXT has three output ports for attaching motors - Ports A, B and C

Sensor ports
The NXT has four input ports for attaching sensors - Ports 1, 2, 3 and 4.

USB port
Connect a USB cable to the USB port and download programs from your computer to the NXT (or upload data from the robot to your computer). You can also use the wireless Bluetooth connection for uploading and downloading.

Loudspeaker
Make a program with real sounds and listen to them when you run the program

NXT Buttons
Orange button : On/Enter /Run
Light grey arrows: Used for moving left and right in the NXT menu
Dark grey button: Clear/Go back

NXT Display
Your NXT comes with many display features - see the MINDSTORMS NXT Users Guide that comes with your NXT kit for specific information on display icons and options

Technical specifications

• 32-bit ARM7 microcontroller
• 256 Kbytes FLASH, 64 Kbytes RAM
• 8-bit AVR microcontroller
• 4 Kbytes FLASH, 512 Byte RAM
• Bluetooth wireless communication (Bluetooth Class II V2.0 compliant)
• USB full speed port (12 Mbit/s)
• 4 input ports, 6-wire cable digital platform (One port includes a IEC 61158 Type 4/EN 50 170 compliant expansion port for future use)
• 3 output ports, 6-wire cable digital platform
• 100 x 64 pixel LCD graphical display
• Loudspeaker - 8 kHz sound quality. Sound channel with 8-bit resolution and 2-16 KHz sample rate.
• Power source: 6 AA batteries

Without the NXT, the LEGO MINDSTORMS cannot be operate. therefore, the NXT is really important to create a robot.


SERVO MOTORS




The three Servo Motors give your robot the ability to move. If you use the Move block in the LEGO MINDSTORMS NXT software to program your motors, the two motors will automatically synchronize, so that your robot will move in a straight line.

Built-in Rotation Sensor
Each motor has a built-in Rotation Sensor. This lets your control your robot’s movements precisely. The Rotation Sensor measures motor rotations in degrees or full rotations [accuracy of +/- one degree]. One rotation is equal to 360 degrees, so if you set a motor to turn 180 degrees, its output shaft will make half a turn.

The built-in Rotation Sensor in each motor also lets you set different speeds for your motors [by setting different power parameters in the software]. Try running the motors at different speeds.

Test it!
Test the built-in Rotation Sensor’s ability to measure distance:



1. Connect a motor to the NXT
2. Select the VIEW submenu on the NXT
3. Select the Motor Rotations icon.
4. Select the port where you have connected the motor
5. Attach a wheel to the motor and measure the rotations as you roll the wheel along the floor

This SERVO MOTORS also one of important part in the LEGO MINDSTORMS part. it will help our robot to make a movement in particular ways.



Inside the LEGO MINDSTORMS, there are 4 types of sensor. There are LIGHT, SOUND, TOUCH and ULTRASONIC sensor. This sensor will help our robot to indicate which kind of obstacle that the robot will face which is depending with the programmed taht we have made for our robot.


i.LIGHT SENSOR





The Light Sensor is one of the two sensors that give your robot vision [The Ultrasonic Sensor is the other]. The Light Sensor enables your robot to distinguish between light and dark. It can read the light intensity in a room and measure the light intensity of colored surfaces.

This is what your eyes see



This is what your robot will see if the light sensor add into your robot.

Suggestions for use
You can use the Light Sensor to make a burglar alarm robot: when an intruder turns on the light in your room the robot can react to defend your property. You can also use the Light Sensor to make a line-following robot or a robot that can sort things by color.

Detecting ambient [surrounding] light
Test the Light Sensor’s ability to read ambient light by measuring the light level in different locations of the room. For example, first hold the sensor against the window. Then hold it under the table. Watch how the readings differ.


ii. SOUND SENSOR




The Sound Sensor can detect both decibels [dB] and adjusted decibel [dBA]. A decibel is a measurement of sound pressure.

dBA: in detecting adjusted decibels, the sensitivity of the sensor is adapted to the sensitivity of the human ear. In other words, these are the sounds that your ears are able to hear.

dB: in detecting standard [unadjusted] decibels, all sounds are measured with equal sensitivity. Thus, these sounds may include some that are too high or too low for the human ear to hear.

The Sound Sensor can measure sound pressure levels up to 90 dB – about the level of a lawnmower. Sound pressure levels are extremely complicated, so the Sound Sensor readings on the MINDSTORMS NXT are displayed in percent [%]. The lower the percent the quieter the soundFor example:

• 4-5% is like a silent living room
• 5-10% would be someone talking some distance away
• 10-30% is normal conversation close to the sensor or music played at a normal level
• 30-100% are people shouting or music being played at a high volume

Test it!

Test the Sound Sensor’s ability to read sound volume:






Connect the Sound Sensor to the NXT.
1. Select the View submenu on the NXT’s display. Select the Sound Sensor icon and the port where you have connected the sensor.
2. Make some sounds into the Sound Sensor and watch the readings displayed on the NXT. Use the sensor to read some sounds around you.
3. How loud do your parents speak? How loud is your front doorbell?

iii. TOUCH SENSOR




The Touch Sensor gives your robot a sense of touch. The Touch Sensor detects when it is being pressed by something and when it is released again.



Suggestions for use
You can use the touch Sensor to make your robot pick up things: a robotic arm equipped with a Touch Sensor lets the robot know whether or not there is something in its arm to grab. Or you can use a Touch Sensor to make your robot act on a command. For example, by pressing the Touch Sensor you can make your robot walk, talk, close a door, or turn on your TV.


iv. ULTRASONIC SENSOR





The Ultrasonic Sensor is one of the two sensors that give your robot vision [The Light Sensor is the other]. The Ultrasonic Sensor enables your robot to see and detect objects. You can also use it to make your robot avoid obstacles, sense and measure distance, and detect movement.

The Ultrasonic Sensor measures distance in centimeters and in inches. It is able to measure distances from 0 to 255 centimeters with a precision of +/- 3 cm.

The Ultrasonic Sensor uses the same scientific principle as bats: it measures distance by calculating the time it takes for a sound wave to hit an object and return – just like an echo.

Large sized objects with hard surfaces return the best readings. Objects made of soft fabric or that are curved [like a ball] or are very thin or small can be difficult for the sensor to detect.

*Note that two or more Ultrasonic Sensors operating in the same room may interrupt each other’s readings.

Test it!

Test the Ultrasonic Sensor’s ability to measure distance:


1.Connect the Ultrasonic Sensor to the NXT
2. Select the View submenu on the NXT. Select the Ultrasonic Sensor icon and the port where you’ve connect the sensor.
3. Measure the distance to an object. For example, move your hand closer to the sensor and watch the readings change

Hopes, with this information, you can get the information about some part inside the LEGO MINDSTORMS...

Therefore, we will meet you all again in next session...That all from Afrobot, for you all viewer.

Introduction

04/02/2009 (Wednesday: 0800-1330)

Hi all… it has been a while we did not upload any entries in this blog. So, now we want to share something about what we have learned from the past few weeks. It might look cliché with the other groups but hopefully you will get something by reading this entry. Enjoy!

During the 5 hours lesson, we have being introduced to the LEGO Mindstorms sets. Each groups managed to get 1 box of it and we were asked to take full responsibilities towards the sets. Our lecturer; En. Abd. Ghani said that we have to be responsible to it as it costs a lot! It reminds me to a line from a movie “guard it with your life!!”… So, let’s get back to the main point. Firstly, we were introduced to each and everyone of the piece in the box. We really had to learn it by hard as it’s a lot!! Then, we went trough its functions; one by one. We were also taught on how to program it using the LEGO Mindstorms software.

After getting to know each other well, we were asked to play with it. We decided to make a robot which uses almost all of the components in the kit like the sensor, motors, and etc. After a few attempts, we managed to build a robot which can move and stop controlled by the voice sensor. I will leave you with the pictures and videos so that you can see it comprehensibly.The thing that we discovered by building the robot is we need to be very patient as it may require us to change the program a few times. However, we also find it interesting as it’s more on hands on work and we did not realize that we have spent 5 hours working on it. Till we meet again next time…

Quotes of the day:

"As a remedy against all ills; poverty, sickness, and melancholy only one thing is absolutely necessary; a liking for work."

Charles Baudelaire (1821-1867)

Robot model

robot using touch sensor

robot move forward for 10 second and then reverse for 10 second

robot move in square

WeLcome to Our BLog

Hye frens....welcome to our BLog..Our group's name is AFROBOT..Do you know why we choose that name? Can you see our hair? is it AFRO?...hahaha... Thats whay we choose AFROBOT for our BLog name...We hope you enjoy when surfing in this BLog...